Purina PURE Athlete 20KGProtein and Fat Supplement An extruded high fat supplement derived from vegetable & flaxseed (source of Omega 3) and contains blood building nutrients (copper, cobalt, folic acid, Vitamin B12). In addition to improving skin, hair coat, hoof condition and muscle mass, research demonstrates that fat spares muscle glycogen. Pur Athlete as a controlled NSC (sugars and starch) level of 17% max.